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Direct Port Plumbing Kits

NOS offers all of the plumbing items you need to custom design your own direct port nitrous system on 4-cylinder, 6-cylinder, and 8-cylinder engines. These kits give you all kinds of flexibility to plumb nitrous oxide into a variety of intake manifolds.

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About Us

Holley® has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies we can give you the edge you need over the competition!

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Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Read More...

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